Battery Powered Portable Amplifier

Battery Powered Portable Amplifier
wireless m
Control EC
directly fro
the mic
Play music, deliver speeches, and project yourself
with excellent sound quality anytime, anywhere
Position vertically for mono sound
Position horizontally for stereo sound
Battery Powered Portable Amplifier
Also available
in white
Perfect for
bridal settings and
in churches.
Digital Wireless System
*AC adaptor included
A great system for conferences and speeches, as well as for musical performances
l Wedding parties
l Presentations at conferences
l Sports training
l Street performances
l Live performances
Battery Powered Portable Amplifier
n Conveniently store mics and
*AC adaptor included
481 mm/
High volume at
maximum SPL of 108 dB
l Unique high-efficiency digital amp capable of
generating high volumes with small amounts of
power. Equipped with two high-efficiency 16 cm
(6.5 inches) speakers that deliver high-quality
sound that surpasses anything in its class.
l High-fidelity performance also accommodates
a wide variety of musical environments.
Unique mono/stereo switching
l Position the BA-55 vertically (mono) for
speeches and other applications where
projection is important. l Position the BA-55
horizontally (stereo) for situations where
you want an expansive sound field, such as
musical performances. l A sensor-activated
mechanism automatically switches between
mono and stereo.
n Uses size AA alkaline batteries
Also supports
rechargeable batteries.
Apporox. six hours of continuous use with
AA batteries.
355 mm/14 inches
n Convenient chime-tone
n Anti-Feedback
n Equalizer for adjusting
your sound
This feature automatically
prevents howling so you can
enjoy high-volume performance
without worrying about mic
placement and volume levels.
n 3-channel mixer function
for instant, hands-on
control of the line input
and two mic inputs.
n Enhance your singing voice
with the echo function.
n You can also use
cabled microphone.
n Auto Power Off
If you forget to turn the power off, the
BA-55 can automatically power itself down.
n Line Out jacks, useful for
direct recording applications.
Two power modes:
Batteries and AC adaptor
l Use the BA-55 anywhere with battery power.
l It can be powered by eight AA alkaline
batteries; you can also use store-bought
rechargeable batteries. l AC adaptor included.
3-channel mixer function
l Connect up to two mics plus an instrument
or audio device. Use the dedicated knobs for
easy mixing. l A variety of inputs are provided
for connecting a wide range of audio devices.
Connect an audio player or
instrument and enjoy high-quality
stereo sound reinforcement.
n A variety of input jacks
Benefits of the digital-wireless system
n Options
n Digital transmission ensures clear tone
Speaker Stand
Microphone Stand
*Includes carrying case
*Includes mic holder and
carrying case
Digital wireless is free from transmission degradation and is unaffected by
external noises.
Echo effect/Chime tone
n Automatic pairing ensures no interference
l Built-in echo function for enhancing vocals;
the effect can be turned on and off directly
from the microphone. l An internal Chime
tone can be activated with a button press for
getting the attention of your audience.
Two built-in wireless receivers
l Expand the setup with up
to two mics. One wireless
Wireless Microphone
mic is included. Add a second DR-WM55
wireless mic (DR-WN55) or
connect a wired mic.
n Can be powered by
AC adaptor (included).
The mics and built-in receivers are automatically paired by scanning
empty channels so you don’t have to worry about interference.
n Control echo on/off from the mic
You can turn the echo effect off when you are speaking, and on for singing.
Advanced and ecological design enables low power
consumption and high sound volumes
n With its digital amp and digital signal-processing engine,
the BA-55 is made to save power
Designed with ecology in mind right from the signal-processing stage, the BA-55 can provide high
volume even on battery power.
n Two-speaker configuration helps deliver high volume with low
power consumption
Equipped with two high-efficiency speakers, the BA-55 delivers high sound volume and is eco friendly.
BA-55 with
optional speaker stand ST-A95
n Specifications
Road-proven design
l Lightweight and compact body;
equipped with carrying handles.
l Heavy-duty construction which
draws from Roland’s extensive
expertise in making musical
instruments. l Convenient auto
power-off function.
[BA-55: Battery Powered Portable Amplifier] lRated Power Output 20 W (10 W + 10 W), SPL 108 dB lNominal Input Level (1 kHz) MIC (XLR type): -50 dBu, AUDIO/INST (RCA phono
type): -10 dBu, AUDIO/INST(Stereo miniature phone type, 1/4" phone type): -20 dBu lNominal Output Level (1 kHz) LINE OUT: -10 dBu lSpeakers 16 cm (6.5 inches) x 2 lWireless
Reception Method Roland original (for only DR-WM55) lConnectors MIC: Input jacks (XLR type, 1/4" TRS phone type), LINE: AUDIO Input jacks (Stereo miniature phone type, RCA
phono type), INST Input jack L/MONO (1/4" phone type), INST Input jack R (1/4" phone type), OUTPUT: LINE OUT jacks (RCA phono type), DC IN: DC IN jack lPower Supply DC 12 V,
Alkaline battery (size AA, LR6 type) x 8, Rechargeable Ni-MH battery (size AA, HR6 type) x 8, AC Adaptor lCurrent Draw 430 mA lExpected battery life under continuous use Alkaline
batteries: about 6 hours, Rechargeable Ni-MH batteries: about 6 hours. These figures will vary depending on the actual conditions of use. lDimensions 355 (W) x 265 (D) x 481 (H) mm,
14 (W) x 10-7/16 (D) x 18-15/16 (H) inches lWeight 9 kg, 19 lbs 14 oz (excluding batteries) lAccessories Wireless Microphone (DR-WM55), Owner’s Manual, Power Cord, AC Adaptor
*0 dBu = 0.775 Vrms
lOptions (sold separately) Wireless Microphone (DR-WM55), Speaker Stand (ST-A95), Microphone Stand (ST-100MB)
[DR-WM55: Wireless Microphone] lElement Dynamic lPolar Pattern Uni directional lMaximum Input SPL 124 dB SPL (3 % THD at 1 kHz) lRF Carrier Frequency 2.4 GHz (ISM Band)
lWireless Transmission Method Roland original lTransmission Power 10 mW lAntenna Built-in antenna lOutreach Line-of-sight 20 m (This figure will vary depending on the actual
conditions of use and the environment.) lPower Supply DC 3 V, Alkaline battery (size AA, LR6 type) x 2, Rechargeable Ni-MH battery (size AA, HR6 type) x 2 lExpected battery life under
continuous use Alkaline batteries: about 24 hours, Rechargeable Ni-MH batteries: about 24 hours. These figures will vary depending on the actual conditions of use. lDimensions 59 (W) x
214 (H) mm, 2-3/8 (W) x 8-7/16 (H) inches lWeight 164 g, 6 oz
Beautiful music, beautiful planet —
Roland is committed to preserving our environment through the development of eco-friendly digital technology and energy-efficient electronic musical instruments.
Visit us online at
All specifications and appearances are subject to change without notice.
Roland is a registered trademark of Roland Corporation in the United States and/or other countries.
All trademarks are the property of their respective companies.
Printed in Japan May 2011 RAM-4694 GR-GEN-SS AB3
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